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Old 01-07-2022, 09:54 AM   #3
Dannyx
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Join Date: Aug 2016
City & State: Constanta
My Country: Romania
Line Voltage: 230VAC 50Hz
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Posts: 3,248
Thumbs up Re: Axis Q6034-E Speed Dome cam No Power (teach me about POE)

I think I already checked all major components and didn't find anything bad, hence why I started this whole thread, just in case someone spots something or knows from former experience a common cause of failure in PoE circuits. It could be I missed something indeed, or the problem is buried somewhere pretty deep.

I don't have the board on hand, but I'll start checking again from the RJ45 jack and work my way inwards. I'll even try something more extreme: provide my own power after the buck converter to see if the camera does anything, just to rule it out. The 4 small output caps of those 2 converters are rated at 25v and although this is a pretty big PTZ camera which would make sense to run on something like 24v, I'm not sure they'd design it that close to the rating of those caps, so maybe the output is 12v or thereabouts - best to start off small. This will also allow me to monitor current in case something else downstream fails only when powered up and measures fine when "cold"...
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